A device and method for improving the signal-to-noise ratio of ultrashort pulse laser
An ultra-short pulse laser, signal-to-noise ratio technology, used in lasers, laser parts, optics, etc., can solve the problems of complex device debugging, low conversion efficiency, low stability, etc., and achieve good time-domain waveform and high conversion efficiency. , the effect of high stability
Active Publication Date: 2015-07-29
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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[0004] In order to solve the technical problems of the existing methods for improving the signal-to-noise ratio of ultrashort pulse lasers, such as small improvement magnitude, low conversion efficiency, complicated device debugging, and low stability, the present invention provides a device and method for improving the signal-to-noise ratio of ultrashort pulse lasers , the invention has the advantages of simple principle, compact structure, high efficiency and stability, simple debugging, etc.
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[0032] The non-linear glass adopted by the present invention has a high third-order nonlinear coefficient (the general third-order nonlinear coefficient requires 10 -12 esu level or above), for example, doped with Bi on glass flakes 2 o 3 , heavy metals, PbO, all are fine.
[0033] Commonly used is Bi 2 o 3 , the purpose is to have a high third-order nonlinear coefficient, and the third-order nonlinear coefficient of this medium can reach 5.8×10 -12 esu, so that a lower power density (GW order) can be used to realize nonlinear elliptical polarization rotation. High conversion efficiency can be obtained by adjusting the angle between the linearly polarized light and the fast axis of the quarter-wave plate to control the ellipticity. The scheme is used to obtain the rotated polarized light to improve the signal-to-noise ratio of the femtosecond pulsed laser, and also obtain a higher conversion efficiency.
[0034] see figure 1 The present invention provides an improvement...
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The invention relates to a device and a method for increasing a signal-to-noise ratio of an ultrashort pulse laser. The device comprises a polarizer, a first quarter wave plate, a first lens, nonlinear glass, a second lens, a second quarter wave plate and an analyzer that are arranged sequentially in a transmission direction of a laser beam, wherein the polarizer is perpendicular to a light-transmission axis direction of the analyzer; the first quarter wave plate is perpendicular to a fast axis direction of the second quarter wave plate; and the nonlinear glass is arranged at a focus overlapping part of the first lens and the second lens. The device and the method solve the technical problems that the available method for increasing the signal-to-noise ratio of an ultrashort pulse is less in increasing magnitude, low in conversion efficiency, complicated in device debugging and low in stability, and have the advantages of simple principle, compact structure, high efficiency, stability, simple debugging and the like.
Description
technical field [0001] The invention belongs to the field of improving the signal-to-noise ratio of ultrashort pulse lasers, and in particular relates to a device and method for realizing the signal-to-noise ratio of ultrashort pulse lasers based on the nonlinear elliptic polarization rotation effect. Background technique [0002] Femtosecond lasers with extremely short pulses and high intensities will display unique optical properties and will create new avenues for studying major scientific questions. The resulting super-strong electric field can already be compared with the bound electric field suffered by electrons in atoms. The new phenomenon and physical mechanism produced by the interaction between strong electric field and matter are the main research content of strong field physics. At the same time, the femtosecond high peak power laser is also an important tool for generating laser plasma and ultrashort X-ray laser. Ultrashort pulse (pulse width is generally fs)...
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IPC IPC(8): H01S3/10G02F1/355G02B27/28
Inventor 刘红军梁师国黄楠孙启兵
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI